From 598d2bdf09d8770f79205f126b497e34e8db7d3a Mon Sep 17 00:00:00 2001
From: Rich Trott <rtrott@gmail.com>
Date: Mon, 28 Dec 2020 16:52:51 -0800
Subject: [PATCH] child_process: treat already-aborted controller as aborting

If an AbortController passed to execfile() is already aborted, use the
same behavior as if the controller was aborted after calling execfile().
This mimics the behavior of fetch in the browser.

PR-URL: https://github.com/nodejs/node/pull/36644
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>
---
 lib/child_process.js                         |  2 ++
 test/parallel/test-child-process-execfile.js | 28 ++++++++------------
 2 files changed, 13 insertions(+), 17 deletions(-)

diff --git a/lib/child_process.js b/lib/child_process.js
index ad5bce3db044d9..1482566ba893dc 100644
--- a/lib/child_process.js
+++ b/lib/child_process.js
@@ -362,6 +362,8 @@ function execFile(file /* , args, options, callback */) {
   }
   if (options.signal) {
     if (options.signal.aborted) {
+      if (!ex)
+        ex = new AbortError();
       process.nextTick(() => kill());
     } else {
       const childController = new AbortController();
diff --git a/test/parallel/test-child-process-execfile.js b/test/parallel/test-child-process-execfile.js
index bf1dfda8bfe982..28bb498ea4b51d 100644
--- a/test/parallel/test-child-process-execfile.js
+++ b/test/parallel/test-child-process-execfile.js
@@ -54,25 +54,19 @@ const execOpts = { encoding: 'utf8', shell: true };
   const ac = new AbortController();
   const { signal } = ac;
 
-  const firstCheck = common.mustCall((err) => {
-    assert.strictEqual(err.code, 'ABORT_ERR');
-    assert.strictEqual(err.name, 'AbortError');
-    assert.strictEqual(err.signal, undefined);
-  });
-
-  const secondCheck = common.mustCall((err) => {
-    assert.strictEqual(err.code, null);
-    assert.strictEqual(err.name, 'Error');
-    assert.strictEqual(err.signal, 'SIGTERM');
-  });
-
-  execFile(process.execPath, [echoFixture, 0], { signal }, (err) => {
-    firstCheck(err);
-    // Test that re-using the aborted signal results in immediate SIGTERM.
-    execFile(process.execPath, [echoFixture, 0], { signal }, secondCheck);
-  });
+  const test = () => {
+    const check = common.mustCall((err) => {
+      assert.strictEqual(err.code, 'ABORT_ERR');
+      assert.strictEqual(err.name, 'AbortError');
+      assert.strictEqual(err.signal, undefined);
+    });
+    execFile(process.execPath, [echoFixture, 0], { signal }, check);
+  };
 
+  test();
   ac.abort();
+  // Verify that it still works the same way now that the signal is aborted.
+  test();
 }
 
 {